Forging worlds

Why isn’t there a massive world/map where you can go crazy with in forge like there was in Halo Reach? Why the step back?

Lag. Especially 4 player split-screen. Although it lags in Halo 4 as well.

yeah the forge is pretty lame in this game.

im struggling to understand why forge even exists…theres no scenery, nothing to use. am i missing something?